Yes did not play Ritual because they ran up against Tucson's curfew. Near the end of the concert, Jon Anderson strapped on a guitar and then looked offstage, where he was talking to someone. He took off the guitar and it was apparent that the group was changing what they were going to play.
In any case, Ritual did not get played that night. They may have played something shorter in its place. I can't remember.
Also, I could have sworn that Anderson played something from the Olias album(which had not been released yet). It included Anderson playing the harp synchronized to a laser light show. It was one of the most stunning effects I have ever seen in a concert (and I have seen Pink Floyd 6 times).